Musical Frequencies
B1
61.74 Hz
Note: B1
Cosmic Octave Color
Derived visible color (552 nm)
Display swatch #a9c727
EstablishedMusical Standard
Evidence Level
Established
Source Count
1
Last Reviewed
March 23, 2026
Directly measured, standardized, or well-supported in mainstream scientific or technical literature.
This entry documents a musical reference or standard. It should be read as an acoustic and musical reference rather than a biological claim.
Review the evidence modelMusical note B in octave 1. Sub-bass range.
Period
16.20 ms
Wavelength
5.56 m
Nearest Note
B1 (0¢)
Claim Type
Musical Standard
Cosmic Octave Color
Derived visible color (552 nm) · #a9c727
Source
Equal temperament tuning system (A4 = 440 Hz)
Sources
Equal Temperament Tuning System
108 atlas references
The twelve-tone equal temperament reference used for note-frequency lookups throughout the atlas.
Standard equal-temperament note table with A4 = 440 Hz.
Harmonic Series
Octave Ladder
Every audible octave of this frequency — the same tone, higher and lower.
Nearby in the Atlas
Entries within ±35 cents of this tone when reduced to the same octave — candidates for pairing or comparison.
B0Musical Frequencies
30.87 Hz0¢
B2Musical Frequencies
123.47 Hz-0.1¢
B3Musical Frequencies
246.94 Hz-0.1¢
B4Musical Frequencies
493.88 Hz-0.1¢
B5Musical Frequencies
987.77 Hz-0.1¢
B6Musical Frequencies
2.0 kHz-0.1¢
musicequal-temperamentoctave-1